Well done for pursuing a resolution. Likewise, I had 3 A6 Allroads before which were superb. I would have had another one but they are no longer made/imported, so I thought the SQ5 would be a good replacement. Air suspension, Bi-Turbo (my last A6 was a Bi turbo). The SQ5 felt like a bit of a boy racer car and was quite cramped in the back compared to the A6. I was a bit miffed to find the dual twin pipe exhausts, which looked great, were actually not connected to anything, which I thought was a bit of a con. I saw an SQ8 the other day with the same issue. The ride finished me off eventually though (and my wife also!). The handling of the SQ5 was pretty outstanding though if you were not carrying passengers! I have now got an A8, which is wonderful to drive and incredibly quiet, so I am happy at the moment. Now I have to find someone who can fit a towbar on the A8, which has proven to be difficult.